【正文】 ntal problems. Can you say something about them? oxygen a special kind of oxygen called “ozone” (O3) a very big hole in the ozone layer, too much harmful radiation from the sun 臭氧層視頻 In our daily life, we should face more environmental problems. Can you say something about them? CO2 carbon dioxide increase a lot, form a “blanket”, the heat from the sun can’t escape cause the level of the sea to rise called “the greenhouse effect” or “globe warming” 溫室效應(yīng)： 視頻 1, 視頻 2 What other kinds of environmental problems can you think of? Talk about them with your classmates. fewer trees factory pollution traffic pollution the ozone layer more carbon dioxide Can you match them? Fewer trees Factory pollution Traffic pollution The ozone layer More carbon dioxide All these problems are very serious. What can we do to solve them? Read and understand （影片） Can you choose a suitable title for each paragraph from the phrases below? The earth is 4 600 million years old. We humans have lived on earth for only 35 000 years, but during this period we have changed our pla a lot in